if `BUILD_LIBTYPE_SHARED` is defined allow build as a shared dll

* Override CC while compiling for ANDROID_ARCH x86

* REfix Override CC while compiling

Allow texture loading with no data transfer (in case image.data = NULL)

MAX_DIRECTORY_FILES macro removed.
ClearDirectoryFiles() tweaked to reflect changes.

Now that 4.3 was added this can be enabled with the compile flag.

- All variables are initialized on declaration, some arrays were not properly initialized
 - Static array buffers require memset() for re-initialization on every function call

NOTE: New raylib release installer uses `w64devkit`, smaller and more updated than regular `mingw64-w64` default project. Paths are updated properly.

It was not working properly... recommended to use `nbnet` instead.

Register keys independently of the actions

Reorganized code and added some feature and listed restrictions. Some gltf models do not work yet.